GRB 220219A
GCN Circular 31609
Subject
GRB 220219A: Fermi GBM Final Real-time Localization
Date
2022-02-19T11:32:48Z (3 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
The Fermi GBM team reports the detection of a likely LONG GRB
At 11:21:34 UT on 19 Feb 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220219A (trigger 666962499.096148 / 220219473).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 41.6, Dec = 9.0 (J2000 degrees, equivalent to J2000 02h 46m, 9d 00'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 79.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220219473/quicklook/glg_skymap_all_bn220219473.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220219473/quicklook/glg_healpix_all_bn220219473.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220219473/quicklook/glg_lc_medres34_bn220219473.gif
GCN Circular 31610
Subject
GRB 220219A: BALROG localization (Fermi Trigger / GRB 220219473)
Date
2022-02-19T12:16:28Z (3 years ago)
From
Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>
F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
at 11:21:34 on 19 Feb. 2022 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).
The best-fit position (1 sigma statistical errors) is:
RA(2000.0) = 37.8+/-0.7 deg
Decl.(2000.0) = 17.0+/-1.1 deg
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB220219473/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB220219473/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB220219473/json
GCN Circular 31611
Subject
GRB 220219A: AGILE/MCAL detection
Date
2022-02-19T14:20:46Z (3 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi (INAF/IAPS), M. Pilia (INAF/OA-Cagliari), M. Tavani (INAF/IAPS, and
Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y.
Evangelista, L. Foffano, E. Menegoni, G. Piano (INAF/IAPS), F. Lucarelli,
C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti,
F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi
(INAF/OAS-Bologna, and Bergen University), A. Trois (INAF/OA-Cagliari), I.
Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani
(INAF/IASF-Mi), report on behalf of the AGILE Team:
The AGILE Mini-CALorimeter (MCAL) detected the GRB 220219A T0 = 2022-02-19
11:21:35.02 +/- 0.01 s (UTC), reported by Fermi GBM (GCN #31609).
The event lasted about 9.5 s and released a total number of 7450 counts in
the MCAL detector (in the 0.4-100 MeV energy range), above an average
background rate of 597 Hz. The MCAL light curve can be found at
http://www.agilescienceapp.it/notices/077070_GRB_MCAL_572354495.021853.png
. The time-integrated spectrum of the burst, from T0-3.0 s to T0+6.5 s, can
be fitted in the energy range 0.4-10 MeV with a power-law with ph.ind. =
-2.83 (-0.24,+0.28), resulting in a reduced chi-squared of 0.78 (48 d.o.f.)
and a fluence of 1.26e-05 erg/cm^2 (90% confidence level), in the same
energy range.
The burst is also clearly visible in the AGILE scientific ratemeters of the
MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence (AC; 50-200 keV)
detectors. The event lasted about 9 s and it released a total number of
13810 counts in the MCAL detector (above a background rate of 1210 Hz), and
33110 counts in the AC detector (above a background rate of 3370 Hz). The
AGILE ratemeter light curves can be found at
http://www.agilescienceapp.it/notices/GRB220219A_AGILE_RM.png . At the T0,
the event was 140 deg off-axis.
The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the
energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress.
Automatic MCAL GRB alert Notices can be found at:
https://gcn.gsfc.nasa.gov/agile_mcal.html.
GCN Circular 31621
Subject
IPN triangulation of GRB 220219A
Date
2022-02-21T16:12:59Z (3 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the HEND/Mars-Odyssey team,
D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,
and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team, and
W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,
and A.S. Gardner on on behalf of the GRS-Odyssey GRB team,
report:
The long-duration GRB 220219A
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 31609;
BALROG localization: Kunzweiler et al., GCN Circ. 31610;
AGILE-MCAL detection: Ursi et al., GCN Circ. 31611)
has been detected by Fermi (GBM trigger 666962499), AGILE (MCAL),
Konus-Wind, and Mars-Odyssey (HEND), so far,
at about 40894 s UT (11:21:34).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
42.243 (02h 48m 58s) +10.588 (+10d 35' 17")
Corners:
43.946 (02h 55m 47s) +6.216 ( +6d 12' 57")
39.857 (02h 39m 26s) +17.180 (+17d 10' 49")
39.457 (02h 37m 50s) +18.548 (+18d 32' 54")
43.844 (02h 55m 23s) +6.598 ( +6d 35' 54")
---------------------------------------------
The error box area is 2243 sq. arcmin, and its maximum
dimension is 13.1 deg (the minimum one is 3.1 arcmin).
The Sun distance was 72 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of, the
Fermi GBM Final Real-time position (GCN Circ. 31609) and BALROG
(GCN 31610) localizations.
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB220219_T40894/IPN/
The Konus-Wind time history and spectrum will be given in a forthcoming
GCN Circular.
GCN Circular 31622
Subject
Konus-Wind observation of GRB 220219A
Date
2022-02-21T17:12:32Z (3 years ago)
From
Anastasia Tsvetkova at Ioffe Institute <tsvetkova@mail.ioffe.ru>
A. Tsvetkova, D. Frederiks, A. Lysenko, A. Ridnaia, D. Svinkin,
M. Ulanov, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 220219A
(Fermi-GBM detection: The Fermi GBM team, GCN 31609;
AGILE/MCAL detection: Ursi at al., GCN31611;
IPN triangulation: Kozyrev et al., GCN 31621)
triggered Konus-Wind at T0=40894.695 s UT (11:21:34.695).
The burst light curve shows a multi-peaked structure
which starts at ~T0-0.4 s and has a total duration of~76.6 s.
The emission is seen up to ~15 MeV.
As observed by Konus-Wind, the burst
had a fluence of 5.75(-2.01,+1.80)x10^-5 erg/cm2,
and a 64-ms peak energy flux, measured from T0+3.792 s,
of 1.08(-0.21,+0.21)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst
(measured from T0 to T0+80.384 s)
is best fit in the 20 keV - 15 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -1.01(-0.39,+0.52),
the high energy photon index beta = -1.86(-1.11,+0.20),
the peak energy Ep = 379(-155,+830) keV,
chi2 = 93/97 dof.
The spectrum near the peak count rate
(measured from T0 to T0+6.656 s)
is best fit in the 20 keV - 15 MeV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with�� alpha = -1.03(-0.10,+0.11),
and Ep = 480(-57,+73) keV (chi2 = 97/98 dof).
Fitting by the GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index:
beta < -2.29 (chi2 = 96.1/97 dof).
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB220219_T40894/
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.